Species that can tolerate wide range of salinity are called $ .............$ .
Euryhaline species.
Weather is the
Assertion $(A):$ A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.
Reason $(R):$ Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.
In the light of the above statements, choose the correct answer from the options given below.
Why do all the fresh water organisms have contractile vacuoles whereas majority of marine organisms lack them ?
The best source of energy in the environment is
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